WARNING
Failure to follow these safety precautions may result in severe injury to
yourself and others.
Check that there is sufficient battery capacity.
Do not operate the model and transmitter steering wheel
for about 3-5 seconds after turning on the GYD550 (When
shared with the receiver).
• GYD550 initialization and neutral position reading. The GYD550 is initialized when the
power is turned on. The neutral position is also read at the same time. If initialization
ends normally, the operator is informed by two repetitive movements of the servo to
the left and right (a little).
Always check the direction of operation of the gyro.
Do not strike the gyro with a hard object. Do not drop it onto
a concrete surface or other hard floor.
• The sensor may become damaged during strong impacts.
Do not use trims or mixing.
• All corrections are made by the gyro. Therefore, if trimming and mixing, are turned on,
operation will be the same as deviating from the neutral position.
Do not use the GYD550 for applications other than RC cars.
•This gyro is designed for RC cars only. Do not use it for other applications.
Analog servos cannot be used.
•The use of analog servos may cause servo trouble.
Do not place gyro near heating equipment (engine, motor,
ESC, battery, servo, etc.).
• Always allow the gyro to adjust to the surrounding environmental temperature before
use. A large temperature change during use will cause drift and other operational
issues.
Connecting the GYD550 S.BUS Connecting the GYD550Connecting the GYD550 S.BUS Connecting the GYD550
Mounting to ChassisMounting to Chassis
Steering servoSteering servo
Only for Futaba digital servo
For RC models
Gyro for RC Drift Cars
INSTRUCTION MANUAL
INSTRUCTION MANUAL
Included sponge
sensor tape
Degrease
and stick
Horizontal plane
Gyro
Flat surface of the chassis where
the sensor tape sticks easily.
Mount the gyro level so that it is
not tilted relative to the chassis.
Use the included double-sided sponge tape to rmly at-
tach the gyro perpendicular to the control axis, at a posi-
tion where there is as little vibration as possible. Make the
wiring loose and bundle it with the included nylon strap
so that it will not interfere with the linkage rod.
Gyro mounting position
The direction of rotation fixed by the gyro can be any
direction within 360° relative to the steering axis controlled
by the gyro.
•Nopartofthismanualmaybereproducedinanyformwithoutpriorpermis-
sion.
•Thecontentsofthismanualaresubjecttochangewithoutpriornotice.
•Futabaisnotliable foranypotentialdamage(accidentalor otherwise) that
mayoccurafterinstallation.
Before using your new gyro, please read this manual thoroughly
and use the gyro properly and safely. After reading this manual,
store it in a safe place.
● Dedicated RC Drift car setting
Vehicle straight-line and cornering performance can be increased without
taking into account the effect of the road surface, etc.
● Remote gain function and mode switching function
You can adjust gain from the transmitter (3 or more CH) by using the remote
gain function. The mode switching function allows AVCS/NORMAL gyro
mode switching.
● Integrated, compact, and light weight
Compact size
（
22.6x19.6x11 mm
）
and light weight
（
5.6 g
）
realized by
high density mounting technology.
● Aluminum case
The GYD550 is equipped with a robust and highly rigid aluminum case.
● Supporting the S.BUS/S.BUS2 connection
Only one wire connection to the receiver can operate the GYD550.
● Only for Futaba digital servo
GYD550 Ratings:
(Integrated sensor type gyro)
• Gyro sensor: MEMS vibrating structure gyro
• Operating voltage: DC 3.5 V to 8.4 V
• Current drain: 30 mA (excluding a servo)
• Operating temperature range: -10 ºC to +45 ºC
• Dimensions: 22.6 x 19.6 x 11.0 mm (0.89 x 0.77 x 0.43 in)
(except protrusion)
• Weight: 5.6 g (0.2 oz)
• Functions: LED monitor. Servo selection (SR mode). S.BUS/S.BUS2
connection.
Features of GYD550Features of GYD550
FunctionsFunctions
Monitor LED display
State Color Move Reference
1. No servo pulse / sensor
error
Red 2 flash
2. Warm-up Green Fast blink
3. Sensor initialization Red/Green ON
AVCS (Red)
NORMAL (Green)
4. Turn Red/Green Fast blink
Right (Green)
Left (Red)
5. Neutral offset Orange Slow blink Steering operation
6. Gain OFF
－
OFF
7. Low battery Red Blink Less than 3.8 V
8. Parameter settings Indicated on the back page
Set ContentsSet Contents
The following items are supplied with the GYD550:
Mini screwdriver
Sensor tape
Extension cord
Nylon strap
GYD550
Thank you for purchasing the
GYD550 RC cars gyro. Compact
and lightweight, the GYD550 is
designed to control steering for RC
Drift cars. Features include S.BUS/
S.BUS2 connectivity.
The transmitter needs 3 or
more channels to control the
gyro gain.
Link the servo in accordance with the kit instruction
manual.
When using S.BUS servo, initialize a parameter.
Make the servo operating range as wide as possible.
Make the numerical value of EPA (ATV) equal in left and
right.
● LED ● Push Switch
Pressusingtheincluded
miniscrewdriver
● Rx（Steering input/S.BUS input）
● Gn（Gain input）
● Sx（Steering servo output）
1M23N35502
AVCS / NORMAL ModesAVCS / NORMAL Modes
The gyro has 2 operating modes: NORMAL mode and
AVCS mode. In the AVCS mode, gyro control is rmer.
Because the feel of operation is different, choose your fa-
vorite mode.
The driver needs to perform
counter-steer
⇒Operation opposite to the
turn direction
Gyro performs countersteer
⇒Steer in the turn direction.
AVCSNORMAL
When GYD550 is turned ONWhen GYD550 is turned ON
The GYD550 requires 3-5 seconds to initialize when the
power is turned on. Do not move the car and do not
move the steering wheel during this initialization or the
gyro may not initialize properly. Once the initialization
process has been completed the steering servo will move
(a little) several times indicating that the GYD550 is now
ready for use. If the neutral has shifted, LED will blink
orange. In that case, it reboots.
SR modeSR mode
It is possible when using the
T7PX(R), T7XC to change the servo
to "SR Mode" and improve the
servo response. If the servo can't be
changed to SR mode, do not set the
TX to SR mode.
S.BUS/S.BUS2 port
S.BUS/S.BUS2 port
Dual Hub
S.BUS Receiver
Steering servo
Steering servo
Steering CH1
Gyro gain CH3
Receiver
S.BUS CH
Steering --- 1CH
Gyro gain --- 3CH
Extension cord
Extension cord
Gn : Not connect
* When using SR mode, S.BUS connection is not possible.
*In SR mode, the transmitter steering channel and
the gyro gain channel should be set to SR-ON.
GYD550
GYD550
When using
other S.BUS2
devices, use a
Dual Hub.
GYD550
Damper (Hunting suppression)Damper (Hunting suppression)Parameter settingsParameter settings
Tuning AdjustmentTuning Adjustment
Setup before a runSetup before a run
Limit SettingLimit Setting
Turn on your transmitter's power. Set the gyro sensitivity
to about 100% at the NORMAL or AVCS side in
accordance with the transmitter instruction manual. Refer
to the <GAIN CH> <AVCS / NORMAL Modes> graph.
*Do not use transmitter trim and sub-trim. Make the neu-
tral setting with a gyro.
By adjusting the gyro gain and Damper, you can adjust
the holding power of the steering and the steering feeling.
The setting we recommend is to drive at 70% gain and set
the damper to the mild side if hunting occurs. The higher
the gain, the greater the gyro effect, and the more hunting
tends to occur.
Set the following GYD550 parameters according to the
“Parameter Settings” section of this manual.
1. Servo type
2. Gyro reverse
3. Neutral setting
4. Limit setting
End point rate
Gain
0%
-55%
+55%
50%
50%
100%
100%
+110%
-110%
AVCS side（LED : RED）
NORMAL side（LED : GREEN）
If the car is turned to the left by
hand → steering goes out on the right
Gyro sensitivity zero
AVCS side
NORMAL side
LED OFF
LED Red
LED Green
Gyro Gain and Mode SwitchingGyro Gain and Mode SwitchingWireless SettingsWireless Settings
＜
GAIN CH
＞
FUTABA CORPORATION
oak kandakajicho 8F 3-4 Kandakajicho, Chiyoda-ku, Tokyo 101-0045, Japan
TEL: +81-3-4316-4820, FAX: +81-3-4316-4823
©FUTABA CORPORATION 2020, 3 (1)
Until orange LED
Until orange LED
Adjust neutral position
with transmitter
Setting mode
1. Servo type
Normal (Default)
Normal (Default)
1 Green
1 Red
2 Green
2 Red
3 Green
3 Red
SR mode
2. Gyro reverse
3. Neutral setting
Reverse
4. Limit setting
Within setting range
Out of setting range
4 Green
5 Green
4 Red
Within setting range
Out of setting range
5. Reset
Initialization
Until orange LED
Until orange LED
Until orange LED
When setting is changed
Fast
flashing
When setting is changed
Fast
flashing
Initialization complete
with orange flash
Fast
flashing
3 times
short push
When initializing
Power off
to escape
The GYD550 can adjust the damper in 8 steps. Dampers
reduce hunting and adjust steering feel.
This damper can be set separately for NORMAL mode
and AVCS mode.
The steering servo moves to
the current limit position.
Next, the steering servo
moves to the reverse side.
Set the limit in the same way.
If the limit is too narrow, the
operation will be adversely
affected. If it is too narrow, the
LED will be red. Adjust so that
the display is green.
The limit position is adjusted
by steering the transmitter.
Operation is maximum
without any bind of the
control linkage or mechanical
limits.
Push the gyro switch as it is.
That position is stored as a
new limit position.
Parameter settings
*Fastashinglasts
about1second
Blinking of the LED 4 times
indicates that the gyro is in the
limit setting mode. When the
button switch is pressed once,
the gyro enters the single-side
(PWM signal wide side) set-
ting mode.
The servo automatically moves
to the current limit position.
When the steering wheel is
moved to the left and right dur-
ing this adjustment, the servo
deflection angle is increased
and decreased.
Damper
Current Damper is displayed
Red；AVCS Green；NORMAL
Setting mode
Damper
1
AVCS
NORMAL
1 Green
1 Red
Damper
2
AVCS
NORMAL
2 Green
2 Red
Damper
3
AVCS
NORMAL
3 Green
3 Red
Damper
4
AVCS
NORMAL
4 Green
4 Red
Damper
5
AVCS
NORMAL
5 Green
5 Red
Damper
6
AVCS
NORMAL
6 Green
6 Red
Damper
7
AVCS
NORMAL
7 Green
7 Red
Damper
8
AVCS
NORMAL
8 Green
8 Red
Escape after
about 10 s
Power off
to escape
Default of NORMAL
Default of AVCS
GYD550 can be wireless set-
ting from T7PX(R)/T7XC and
R334SBS/R334SBS-E. In that
case, it is necessary to update
T7PX(R)/T7XC and R334SBS/
R334SBS-E to the version cor-
responding to GYD550 wireless
setting. Refer to the version
update manual for setting details.
When the button switch is momen-
tarily pressed once when the steering
servo is in the position at which the
steering linkage does not
strike a stopper, that position
is memorized.
To complete setting, move the
servo to the position to be memo-
rized at the other (narrow) side.
Move the steering wheel to the left
and right and set the limit position
the same as the setting described
above. When setting is complete, the LED will blink
4 times. In this state, move the steering wheel and
check if the limit positions are normal. (The servo
operating angle moves 1.5 times the movement of the
stick.) If there is any offset, press the button switch
and repeat setting in both directions.
When the remote gain function is used, NORMAL and
AVCS mode switching is performed in accordance with
the direction of operation of the transmitter's remote gain
channel. At the + rate side, the AVCS mode is selected
and at the – rate side, the
NORMAL mode is selected.
The sensitivity is changed by
adjusting the end point rate.
The sensitivity setting criteria
by end point is shown
in the gure below.
For GYD550, NORMAL/AVCS switching and gyro gain
are performed by the transmitter.The settings on the main
unit are the 6 items in the following table.
Hunting → To Mild sideHunting → To Mild side
◇ Within setting range → Green LED blinks quickly
◆ Out of setting range → Red LED blinks quickly re
setting
-
1
-
2
